Tilesets:
chaos_zone_shared.png - from github.com/chaosz0ne/shared - license unknown
fantasy.png - from github.com/chaosz0ne/shared - license unknown
floortileset.png - from https://www.deviantart.com/3lv3n/art/Grass-and-dungeon-floor-tile-map-with-some-snow-700702945 - CC-BY-SA 3.0
haus_a.png - from github.com/chaosz0ne/shared - license unknown
tilesets_deviant_milkian_1.png - from https://www.deviantart.com/milkian/art/Tilesets-FSM-RM2K3-para-VX-Ace-Set-Escritorio-651542743 based on tiles from FSM (see https://rpgmaker.fandom.com/wiki/First_Seed_Material)
krautspace/... - from us (bernd) - CC-0
request_april_by_nicnubill.png - from https://www.deviantart.com/nicnubill/art/Request-April-446589125 - CC-BY 3.0
tilesets_nicnubill_2.png  - from https://www.deviantart.com/nicnubill/art/Modern-signs-420642941 - CC-BY 3.0